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Normally it depends on type of workload running on the Filesystem.
Without unmount, snapshot is crash consistent. Based on workload (e.g. database), quiescing it will give app/db consistent snapshot. Below are some good blogs to manage the snapshot process and crash consistent snapshot.
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Can be done w/o unmount but, at least in Linux, beware of disk caches. I find some files missing in restored snapshots, Also I found that it is leveraged by issuing a good ol'
sudo sync
before live snapshotting the volume.